%%%-------------------------------------------------------------------
%%% @doc Обработчик бронирований текущего пользователя (клиентский API).
%%% GET – возвращает список всех бронирований, сделанных пользователем.
%%% @end
%%%-------------------------------------------------------------------
-module(handler_user_bookings).
-behaviour(cowboy_handler).

-export([init/2]).
-export([trails/0]).

-include("records.hrl").

%%% cowboy_handler callback
-spec init(cowboy_req:req(), any()) -> {ok, cowboy_req:req(), any()}.
init(Req, Opts) ->
  handle(Req, Opts).

%%% Swagger metadata
-spec trails() -> [map()].
trails() ->
  [
    #{
      path        => <<"/v1/user/bookings">>,
      method      => <<"GET">>,
      description => <<"List bookings of the current user">>,
      tags        => [<<"Bookings">>],
      responses   => #{
        200 => #{
          description => <<"Array of bookings">>,
          content => #{<<"application/json">> => #{schema => #{
            type  => array,
            items => booking_schema()
          }}}
        },
        401 => #{description => <<"Unauthorized">>}
      }
    }
  ].

booking_schema() ->
  #{
    type       => object,
    properties => #{
      id            => #{type => string},
      event_id      => #{type => string},
      user_id       => #{type => string},
      status        => #{type => string, enum => [<<"pending">>, <<"confirmed">>, <<"cancelled">>]},
      notes         => #{type => string, nullable => true},
      reminder_sent => #{type => boolean},
      confirmed_at  => #{type => string, format => <<"date-time">>, nullable => true},
      created_at    => #{type => string, format => <<"date-time">>},
      updated_at    => #{type => string, format => <<"date-time">>}
    }
  }.

%%%===================================================================
%%% HTTP-методы
%%%===================================================================

%% @private
-spec handle(cowboy_req:req(), any()) -> {ok, cowboy_req:req(), any()}.
handle(Req, _Opts) ->
  case cowboy_req:method(Req) of
    <<"GET">>  -> list_user_bookings(Req);
    _          -> handler_utils:send_error(Req, 405, <<"Method not allowed">>)
  end.

%% @doc GET /v1/user/bookings — список бронирований текущего пользователя.
-spec list_user_bookings(cowboy_req:req()) -> {ok, binary(), cowboy_req:req()}.
list_user_bookings(Req) ->
  case handler_utils:auth_user(Req) of
    {ok, UserId, Req1} ->
      case logic_booking:list_user_bookings(UserId) of
        {ok, Bookings} ->
          Response = [booking_to_json(B) || B <- Bookings],
          handler_utils:send_json(Req1, 200, Response);
        {error, _} ->
          handler_utils:send_error(Req1, 500, <<"Internal server error">>)
      end;
    {error, Code, Message, Req1} ->
      handler_utils:send_error(Req1, Code, Message)
  end.

%%%===================================================================
%%% Внутренние функции
%%%===================================================================

%% @private Формирует JSON-представление записи #booking{}.
-spec booking_to_json(#booking{}) -> map().
booking_to_json(Booking) ->
  #{
    id            => Booking#booking.id,
    event_id      => Booking#booking.event_id,
    user_id       => Booking#booking.user_id,
    status        => Booking#booking.status,
    notes         => Booking#booking.notes,
    reminder_sent => Booking#booking.reminder_sent,
    confirmed_at  => case Booking#booking.confirmed_at of
                       undefined -> null;
                       Dt        -> handler_utils:datetime_to_iso8601(Dt)
                     end,
    created_at    => handler_utils:datetime_to_iso8601(Booking#booking.created_at),
    updated_at    => handler_utils:datetime_to_iso8601(Booking#booking.updated_at)
  }.